Eazels.com ~ I found this website really useful when it comes to lino printing, although it offers suggestions and visuals on other artistic disciplines. The article https://www.eazels.com/a-guide-to-positive-and-negative-space-in-linocut offers an in depth look at positive and negative space in lino and good tips on composition. Less details in drawing results in a better print with more focus.
Handprinted.co.uk is another good source for printing info having tutorials on different digital formats such as YouTube videos or blog posts and Instagram.